Only internal snapshots for QCOW2 disks?

Hi all! While I'm playing around with Proxmox in my lab, namely with snapshots, I have noticed one thing: irrespective of the storage backend (NFS or directory, unless we're talking about ZFS which has snapshots), if I have QCOW2 disk on it, Proxmox will always create an internal snapshot. I have checked this with qemu-img snapshot -l against the QCOW2 disk and it lists the snapshot inside of it.

So the question is, is it indeed the only snapshot mechanism (internal snapshot) Proxmox does...

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